Ways to build city-based groups?

So I enjoy attending the monthly Chicago-IF meetups when enough of us can make it…but that leaves a few questions.

How do we grow a city-based IF group?

What are ways to get new people to come along?

What are the sorts of activities people plan beyond just getting together and being with people they like and share interests with?

I enjoy the core of people that come to Chicago-IF but would love to see even more. As Lucea mentioned in the NY topic, it’s a new year and time to try new stuff. Any suggestions?